Question

use the information and diagram to complete part a and part b. students setup an experiment using a dialysis tubing bag and beaker of solution. the bag and the beaker each have varying concentrations of solute and water. after 24 hours, they notice that the bag decreased in mass. part a: which of the following statements best describes the results of their experiment? a. the bag decreased in mass because the solution in the bag is isotonic. b. the bag decreased in mass because the solution in the bag is hypertonic. c. the bag decreased in mass because the solution in the beaker is hypertonic. d. the bag decreased in mass because the solution in the beaker is hypotonic. part b: how could students modify their experiment so that the mass of the bag increases? a. they could decrease the concentration of water in the bag so that water exits it. b. the could decrease the concentration of solute in the bag so that water enters it. c. they could increase the concentration of water in the bag so that water enters it. d. they could increase the concentration of solute in the bag so that water

Explanation:

In osmosis, water moves from an area of lower solute concentration to an area of higher solute concentration across a selectively - permeable membrane. The bag decreased in mass, which means water left the bag. This occurs when the solution in the beaker is hypertonic (higher solute concentration) compared to the solution in the bag. To increase the mass of the bag, water needs to enter it, which can be achieved by making the solution in the beaker hypotonic (lower solute concentration) or by decreasing the solute concentration in the bag so that water enters.

Answer:

Part A: C. The bag decreased in mass because the solution in the beaker is hypertonic.
Part B: They could decrease the concentration of solute in the bag so that water enters it.